The passive voice is used when the subject receives the action and is what you want to highlight the most.

The passive voice in the simple past is formed using the past tense of the verb 'to be' (was/were) followed by the past participle of the main verb.

Estructure:

(+) Obj + was/were + v3 + by + object pronum.

(-) Subject +wasn´t / weren´t + past participle verb + (by agent)

(?) verb to be + object of action + verb in past participle + complement

Example:

(+) The strawberry pie was eaten by me.

(-) Lubna is not helped by Salma.

(?) Was the letter written by her?

The passive voice (passive voice) in the present simple is used when you want to express an action by placing more emphasis on the object than on the person performing the action.

Estructure:

(+) Subject + to be (am/is/are) + past participle + (by/on the part of) + agent.

(-) is subject + auxiliary verb “to be” (am/is/are) + negative adverb (not) + past participle

(?) Auxiliar verb + subject + principal verb + complement?

Example:

(+) The flowers are cared for.

(-)Spanish is not spoken in China.

(?) Is she calling me?

The future simple When the object is more important than the subject.

To avoid mentioning the subject or when it is not known.

To make a formal or neutral statement.

In scientific or academic writings to focus on the process or result.

Estructure:

(+) Subject + will be + past participle + (by + agent)

(-) Subject + auxiliary will + not + infinitive verb + complement

(?) Subject + will be + past participle + (by + agent)?

Example:

(+) A book will be read by John.

(-) We won't be asked to speak at the conference.

(?) Will Jen finish War and Peace over the summer?